grub2: update sync code for background thread
grub2: send signal when property changed
datetime: add UserTimezoneList
accounts: test
accounts: uninstall user object
system-info: change file name
datetime: modify CityList func
accounts: print error info
accounts: close watcher
Merge branch 'develop' into accounts
accounts: modify service
update fsnotify
accounts: add policykit
accounts: change the pid acquisition method
display: revise update logical
accounts: modify user icon
accounts: modify makefile
accounts: delete personalization
grub2: update resetGfxmodeIfNeed()
grub2: notify signal when property changed